O'Fallon Weather in June
Average highs run from 84°F on June 1 to 90°F on June 30, and lows from 61°F to 67°F. Normal precipitation for the month is 4.62 in over about 9 wet days.
June day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
June at a glance
- Average high
- 87°F
- Average low
- 65°F
- Precipitation
- 4.62 in
- Record high
- 106°FJun 28, 2012
- Record low
- 38°FJun 1, 1972
- Chance of a freeze
- 0%
- Days of 90°F or more
- 11.6
- Daylight
- 14 h 41 min to 14 h 49 min
- Cloud cover
- 55%
- Humidity
- 77%
- Dew point
- 66°F
- Wind
- 6.9 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Jun 1 | 84°F | 61°F | 93°F 1951 | 38°F 1972 | 32% | 0% |
| Jun 2 | 84°F | 61°F | 93°F 1951 | 45°F 1966 | 32% | 0% |
| Jun 3 | 84°F | 62°F | 97°F 2011 | 42°F 1969 | 32% | 0% |
| Jun 4 | 85°F | 62°F | 98°F 2011 | 48°F 1969 | 32% | 0% |
| Jun 5 | 85°F | 62°F | 98°F 2011 | 43°F 1990 | 31% | 0% |
| Jun 6 | 85°F | 62°F | 96°F 1977 | 46°F 2000 | 31% | 0% |
| Jun 7 | 86°F | 63°F | 97°F 1969 | 46°F 2000 | 31% | 0% |
| Jun 8 | 86°F | 63°F | 97°F 1969 | 49°F 2023 | 31% | 0% |
| Jun 9 | 86°F | 63°F | 99°F 1953 | 45°F 1978 | 31% | 0% |
| Jun 10 | 86°F | 63°F | 98°F 1953 | 42°F 1988 | 30% | 0% |
| Jun 11 | 87°F | 64°F | 95°F 2011 | 43°F 1972 | 30% | 0% |
| Jun 12 | 87°F | 64°F | 99°F 1953 | 44°F 1980 | 30% | 0% |
| Jun 13 | 87°F | 64°F | 98°F 1952 | 48°F 1985 | 30% | 0% |
| Jun 14 | 87°F | 64°F | 98°F 1987 | 46°F 1978 | 30% | 0% |
| Jun 15 | 88°F | 65°F | 100°F 1952 | 52°F 1961 | 30% | 0% |
| Jun 16 | 88°F | 65°F | 100°F 1952 | 43°F 1989 | 30% | 0% |
| Jun 17 | 88°F | 65°F | 96°F 2018 | 49°F 1980 | 29% | 0% |
| Jun 18 | 88°F | 65°F | 99°F 1953 | 48°F 1965 | 29% | 0% |
| Jun 19 | 88°F | 65°F | 102°F 1953 | 50°F 1965 | 29% | 0% |
| Jun 20 | 89°F | 66°F | 102°F 1953 | 44°F 1980 | 29% | 0% |
| Jun 21 | 89°F | 66°F | 98°F 1988 | 42°F 1992 | 29% | 0% |
| Jun 22 | 89°F | 66°F | 98°F 1988 | 41°F 1992 | 28% | 0% |
| Jun 23 | 89°F | 66°F | 99°F 1988 | 45°F 1972 | 28% | 0% |
| Jun 24 | 89°F | 66°F | 101°F 1988 | 44°F 1972 | 28% | 0% |
| Jun 25 | 89°F | 67°F | 100°F 1952 | 47°F 1979 | 28% | 0% |
| Jun 26 | 89°F | 67°F | 103°F 1954 | 48°F 1979 | 28% | 0% |
| Jun 27 | 89°F | 67°F | 101°F 1952 | 50°F 1992 | 27% | 0% |
| Jun 28 | 90°F | 67°F | 106°F 2012 | 49°F 1968 | 27% | 0% |
| Jun 29 | 90°F | 67°F | 106°F 2012 | 55°F 1970 | 27% | 0% |
| Jun 30 | 90°F | 67°F | 103°F 2012 | 55°F 1980 | 27% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- June 1
- sunrise 5:37 AM, sunset 8:18 PM
- June 30
- sunrise 5:39 AM, sunset 8:28 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00013802 (Belleville Siu Rsch), public domain. Records: NOAA GHCN-Daily, station USW00013802, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.